fix(): fixed issue with syncing refresh interval to url

public/app/features/dashboard/time_srv.ts

@@ -116,10 +116,12 @@ class TimeSrv {
     }
     }
 
 
     // update url
     // update url
+    if (interval) {
       var params = this.$location.search();
       var params = this.$location.search();
       params.refresh = interval;
       params.refresh = interval;
       this.$location.search(params);
       this.$location.search(params);
     }
     }
+  }
 
 
   refreshDashboard() {
   refreshDashboard() {
     this.$rootScope.$broadcast('refresh');
     this.$rootScope.$broadcast('refresh');